Endoscopic procedure, Pituitary tumor surgery, Acoustic neuroma surgery, Epilepsy surgery, Intraoperative magnetic resonance imaging, Skull base surgery, Minimally invasive neurosurgery, Pituitary tumor, CSF leak, Cavernous malformations, Epilepsy, Craniopharyngioma, Meningioma, Chordoma, Brain tumor, Acoustic neuroma, Chondrosarcoma, Skull base tumor